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Contributions of Inter- and Intraband Excitations to Electron Heat Capacity and Electron-Phonon Coupling in Noble Metals

[+] Author and Article Information
Patrick E. Hopkins

Engineering Sciences Center, Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185-0346pehopki@sandia.gov

J. Heat Transfer 132(1), 014504 (Nov 04, 2009) (4 pages) doi:10.1115/1.3192133 History: Received January 08, 2009; Revised May 28, 2009; Published November 04, 2009; Online November 04, 2009

This work examines the effects of photonically induced interband excitations from the d-band to states at the Fermi energy on thermophysical properties in noble metals. The change in the electron population in the d-band and the conduction band causes a change in electron heat capacity and electron-phonon coupling factor, which in turn impacts the evolution of the temperature after pulse absorption and electron thermalization. Expressions for heat capacity and electron-phonon coupling factor are derived for electrons undergoing both inter- and intraband transitions. In noble metals, due to the large d-band to Fermi energy separation, the contributions to electron heat capacity and electron-phonon coupling factor of intra- and interband transitions can be separated. At high absorbed laser fluences and pulse energies greater than the interband transition threshold, the interband and intraband contributions to thermophysical properties differ.

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Grahic Jump Location
Figure 1

Predictions of (a) electron heat capacity and (b) electron-phonon coupling factor in Au. The numerical calculations are performed using only the s-band density of states (s-band only), the s- and d-band density of states with no photonic excitation (s+d bands), and the s- and d-band density of states with a photonic excitation, hν (hν=1.55 eV, hν=2.4 eV, hν=3.1 eV, and hν=4.65 eV). The s-band density of states calculations show close agreement to low temperature theory throughout the temperature range Te=0–10,000 K.

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